But product 10213 always works perfect. I wire product 10213 on a bread board with this wire guide.http://bildr.org/2012/03/rfp30n06le-arduino/

I used a comment on product 10256 to wire it. Comment is below.

Looking at this picture going clockwise starting at the very top left:* The headlight's negative lead* The headlight's positive lead* Your supply voltage (The voltage/current your headlight needs)* Gnd* And Arduino IO pin1 and 4 are connected through the mosfet. Connectivity between those two pins is controlled by 5.2 and 3 are connected together directly, so they could be omitted.